btw, the problem with your tweet button isn't that you forgot javascript: it's that your link isn't correct.
You put :
http://twitter.com/share?url=http%3A%2F%2Fpspradio.co.uk/s.php?s='+top.KKplayer.stream_URL+'&text=%23NowPlaying '+top.KKplayer.station_Song+' %2Fvia PSP Radio
And it should be:
http://twitter.com/share?url=http://pspradio.co.uk/s.php?s='+top.KKplayer.stream_URL+'&text=%23NowPlaying '+top.KKplayer.station_Song+' /via PSP Radio